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Sichuan Univ, West China Univ Hosp 2, Natl Off Maternal & Child Hlth Surveillance China, Ren Min South Rd,Sect 3 17, Chengdu, Sichuan, Peoples R China
Sichuan Univ, West China Univ Hosp 2, Dept Obstet, Ren Min South Rd,Sect 3 17, Chengdu, Sichuan, Peoples R China Sichuan Univ, West China Univ Hosp 2, Natl Off Maternal & Child Hlth Surveillance China, Ren Min South Rd,Sect 3 17, Chengdu, Sichuan, Peoples R China